rhashtable: Remove max_shift and min_shift

Now that nobody uses max_shift and min_shift, we can safely remove
them.
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>

include/linux/rhashtable.h

@@ -83,8 +83,6 @@ struct rhashtable;
  * @key_len: Length of key
  * @key_offset: Offset of key in struct to be hashed
  * @head_offset: Offset of rhash_head in struct to be hashed
- * @max_shift: Maximum number of shifts while expanding
- * @min_shift: Minimum number of shifts while shrinking
  * @max_size: Maximum size while expanding
  * @min_size: Minimum size while shrinking
  * @nulls_base: Base value to generate nulls marker
@@ -97,8 +95,6 @@ struct rhashtable_params {
 	size_t			key_len;
 	size_t			key_offset;
 	size_t			head_offset;
-	size_t			max_shift;
-	size_t			min_shift;
 	unsigned int		max_size;
 	unsigned int		min_size;
 	u32			nulls_base;

lib/rhashtable.c

@@ -188,7 +188,6 @@ static bool rht_grow_above_75(const struct rhashtable *ht,
 {
 	/* Expand table when exceeding 75% load */
 	return atomic_read(&ht->nelems) > (tbl->size / 4 * 3) &&
-	       (!ht->p.max_shift || tbl->size < (1 << ht->p.max_shift)) &&
 	       (!ht->p.max_size || tbl->size < ht->p.max_size);
 }
 
@@ -202,7 +201,6 @@ static bool rht_shrink_below_30(const struct rhashtable *ht,
 {
 	/* Shrink table beneath 30% load */
 	return atomic_read(&ht->nelems) < (tbl->size * 3 / 10) &&
-	       tbl->size > (1 << ht->p.min_shift) &&
 	       tbl->size > ht->p.min_size;
 }
 
@@ -875,8 +873,7 @@ EXPORT_SYMBOL_GPL(rhashtable_walk_stop);
 static size_t rounded_hashtable_size(struct rhashtable_params *params)
 {
 	return max(roundup_pow_of_two(params->nelem_hint * 4 / 3),
-		   max(1UL << params->min_shift,
-		       (unsigned long)params->min_size));
+		   (unsigned long)params->min_size);
 }
 
 /**
@@ -936,8 +933,6 @@ int rhashtable_init(struct rhashtable *ht, struct rhashtable_params *params)
 	if (params->nulls_base && params->nulls_base < (1U << RHT_BASE_SHIFT))
 		return -EINVAL;
 
-	params->min_shift = max_t(size_t, params->min_shift,
-				  ilog2(HASH_MIN_SIZE));
 	params->min_size = max(params->min_size, HASH_MIN_SIZE);
 
 	if (params->nelem_hint)